EM-Promise
A promise / deferred implementation for EventMachine inspired by AngularJS / Kris Kowal’s Q.
From the perspective of dealing with error handling, deferred and promise apis are to asynchronous programing what try, catch and throw keywords are to synchronous programming.
require 'rubygems'
require 'em-promise'
def asyncGreet(name)
deferred = EM::Q.defer
EM::Timer.new(5) do
EM.defer do
deferred.resolve("Hello #{name}")
end
end
deferred.promise
end
EventMachine.run do
asyncGreet('Robin Hood').then(proc { |greeting|
p "Success: #{greeting}"
}, proc { |reason|
p "Failed: #{reason}"
})
asyncGreet('The Dude').then do |greeting|
p "Jeff '#{greeting}' Lebowski"
end
end
Start using it now
- Read the Documentation
- Then
gem install em-promise